Hot-air furnace



(No Modem H. ROBINSON.

HOT AIR FURNAGE.

Patented Dec. 29, 1885.

NITED STATES PATENT OFFICE.

HENSON ROBINSON, OF SPRINGFIELD, ILLINOIS.

HOT-AIR FURNAC E.

SPECIPICATION forming part of Letters Patent No. 333,425. dated December 29, 1885.

Application filed May 12, 1884.

` To all whmn it may concern- Be it known that I, HENsoN ROBINsoN, of Springfield, in the county of Sangamon and State of Illinois, have invented a new and useful Improvement in Hot-Air Furnaces; and I do hereby declare that the following is afull and exact description of the same, reference being' had to the accompanying drawings, and to the letters of reference marked thereon.

The improvements which I have devised in the class of hot-air furnaces relate, principally, to the air-flues and their connections, and my purpose is to bring them into closer relationship with the fire-pot and ash-pit, in order that they may be subjected to a more intense heat, and that the currents of outside air admitted to the ash-pit may pass Vmore quickly into and through these flues.

The novelt'y therein consists in the arrangement of the air-flues in their connections with the fire-pot and ash-pit, respectively, and in various other details of construction and combination of parts, all as more fully hereinafter described and claimed.

For the better understanding of my improvements and the manner of applying them to a furnace of this kind, attention is invited to the accompanying drawings, wherein- Figure lis a front elevation of the lower section of a hot-air furnace, with its outer cylinder broken away to show myimprovements; Fig. 2, aplan view of the same, with portions broken away and in section.

Like letters refer to corresponding parts throughout the several Views.

A denotes the cylindrical base of the furnace, supporting the outer Sheet-iron cylinder or casing, B, within which is arranged the ashpit and fire-pot, which, together with my improvements, complete the lower section of the furnace. The ash-pit O is provided at one end with an ordinary door, a, having asuitable register, b, for regulating the supply of air to the furnace, and this pit C has a top covering' or plate, O', with a central opening, immediately below which is arranged the grate.

Serial No. 131,217. (No model.)

This top covering or plate, C', of the ash-pit supports a cone or other suitably-shaped firepot, D, and is provided Withopenings or perforations, c, arranged at points equidistant apart outside of the said fire-pot and near the same. Each of these perforations is surrounded or inclosed by a cup, d, in which thelower ends of the air-flues E are seated. These flues, consisting each of a pipe or tube, are arranged vertically, or nearly so, and connect with a fiange, e, around the top of the fire-pot. The air passing up through these flues has outlet through a series of small perforations, f, arranged in the flang'e e of the fire-pot, in a manner similar to the openings orperforations in the top of the ash-pit.

At the point of connection between the firepot and ash-pit, and below the opening in the top plate of the latter, is arranged the grate F, which may be of any suitable construction convenient to operate, that shown being one which I propose to make the subject of a future application.

The advantages ofmy improvements need no particular mention other than has already been noted and made manifest by the description.

I am aware that it is not new to make communication between the ash-pit and fire-pot of furnaces by means of exterior flue-pipes, 

